Year	% of total teachers
1999	62.0983009338379
2000	62.0989990234375
2001	57.5000381469727
2002	59.9986305236816
2004	79.7003173828125
2006	93.8097305297852
2007	96.0006103515625
2008	97.0004577636719
2009	94.5191802978516
2010	98.3488311767578
2014	93.2489318847656
2016	89.1449508666992
2017	93.5570220947266
2018	89.5443267822266